Universal Magnetometer with Earth Inductor

This instrument is marked "DEPARTMENT OF TERRESTRIAL MAGNETISM Carnegie Institution of Washington E.I. - M No 26." It was designed and produced by the Department of Terrestrial Magnetism of the Carnegie Institution of Washington. Unlike the Carnegie's original universal magnetometer, this one is equipped with an earth inductor to determine dip. It was completed in 1914, compared with standard magnetic instruments at the Kew and Greenwich observatories in England, and at the U.S. Coast and Geodetic Survey’s observatory at Cheltenham, Md., and used in many locations around the world.

Ref: J. A. Fleming and J. A. Widner, "Description of the C.I.W. Combined Magnetometer and Earth Inductor," Terrestrial Magnetism 18 (1913): 105-110.

Carnegie Institution of Washington. Department of Terrestrial Magnetism. Land Magnetic Observations, 1911-1913 (Washington, D.C., 1915), pp. 9-12.

Currently not on view
Currently not on view
Object Name
universal magnetometer with earth inductor
Date made
Carnegie Institution of Washington. Department of Terrestrial Magnetism
Physical Description
metal (overall material)
overall (instrument case): 7 1/4 in x 21 1/4 in x 15 3/4 in; 18.415 cm x 53.975 cm x 40.005 cm
Place Made
United States: District of Columbia, Washington
ID Number
accession number
catalog number
Measuring & Mapping
Science & Mathematics
Science & Scientific Instruments
Science & Scientific Instruments
See more items in
Medicine and Science: Physical Sciences
Data Source
National Museum of American History, Kenneth E. Behring Center
Credit Line
U.S. Department of Commerce, Coast & Geodetic Survey

Visitor Comments

Add a comment about this object

**Please read before submitting the form**

Have a comment or question about this object to share with the community? Please use the form below. Selected comments will appear on this page and may receive a museum response (but we can't promise). Please note that we generally cannot answer questions about the history, rarity, or value of your personal artifacts.

Have a question about anything else, or would you prefer a personal response? Please visit our FAQ or contact page.

Personal information will not be shared or result in unsolicited e-mail. See our privacy policy.

Enter the characters shown in the image.